Add a context parameter to callOnMainThread. The old form is going to be...

webkit/glue/webkitclient_impl.cc

Index: webkit/glue/webkitclient_impl.cc
===================================================================
--- webkit/glue/webkitclient_impl.cc	(revision 45810)
+++ webkit/glue/webkitclient_impl.cc	(working copy)
@@ -336,6 +336,10 @@
   main_loop_->PostTask(FROM_HERE, NewRunnableFunction(func));
 }
 
+void WebKitClientImpl::callOnMainThread(void (*func)(void*), void* context) {
+  main_loop_->PostTask(FROM_HERE, NewRunnableFunction(func, context));
+}
+
 base::PlatformFile WebKitClientImpl::databaseOpenFile(
     const WebKit::WebString& vfs_file_name, int desired_flags,
     base::PlatformFile* dir_handle) {